A BMS (Battery Management System) is the control system that lets a battery made up of multiple cells be used safely and efficiently.

Built around semiconductors from Texas Instruments (TI, USA), TEKJP develops fully domestic, Japan-made BMS units and chargers from the ground up for each application—covering everything from PCB design to firmware source-code development. By combining high-precision SoC estimation based on TI's Impedance Track™ technology with warning detection driven by our proprietary firmware, we deliver BMS units for the high-reliability battery modules that drone flight safety depends on.

With cell balancing—equalizing the voltage of each cell during charging—as our core technology, we design boards tailored to the required output range, safety requirements, and communication specifications, from small airframes such as drones to data center backup power.

Areas of development

TEKJP develops BMS solutions tailored to the differing requirements of each application. Voltage range, capacity, redundancy, and operating environment vary widely from one use case to the next, but the core common to every project is the same: understanding cells accurately and managing them safely.

Drones

For industrial drones, we develop BMS units and chargers in 6S–18S configurations. Beyond being lightweight and high-output, they couple tightly with the flight controller through our proprietary CAN / DroneCAN support, monitoring cell status at high speed during flight.

eVTOL

For electric vertical take-off and landing aircraft (eVTOL) and electric helicopters, we develop high-voltage BMS units exceeding 100S. We design with redundancy capable of withstanding manned flight, and with a focus on the high reliability that aviation safety directly depends on.

Data Center BBU

For AI data centers, we are developing BMS units for large BBUs (battery backup units) with the OCP standard in view. We are advancing support for 800V-class high-voltage and highly parallel configurations, delivering designs that ensure reliable operation during momentary outages and power faults.

Core technologies

Whatever the application, TEKJP's BMS units share a common technical core: high-precision SoC estimation, cell-voltage balancing, support for high voltage and high current, and integrated development that extends all the way to the charger. We place importance on optimizing the battery not as a standalone unit, but as part of the power system as a whole.

High-precision SoC estimation and warning detection

Using TI's Impedance Track™ technology, we estimate state of charge (SoC) with high precision from the internal impedance of the cells. Combined with warning detection for overcurrent, overvoltage, temperature anomalies, and more via our proprietary firmware, this makes it possible to grasp battery status in real time, even during flight or operation.

Cell-voltage balancing

By equalizing the voltage of each cell during charging, we draw out full charge capacity while preventing load from concentrating on particular cells. Built on TI's BQ series, this is the core control technology of a BMS that supports a wide range of configurations, from 6S to over 100S.

High-voltage, high-current design

With our proven 75V class for drones as a foundation, we are expanding our design into the 400V and 800V classes. Optimized board design and thermal design also let us handle large currents on the order of several hundred amperes.

Integrated development with the charger

We develop not only the BMS but the charger as well, in-house. The BMS and charger coordinate over CAN communication to deliver optimal charge-profile control according to cell status. By designing the battery, BMS, and charger as a single integrated system, we make optimization for each application possible.